- Ideally, it would preserve maximum security, so your keys aren’t exposed unnecessarily, but the funds are accessible to your trusted people.
This can only be done through Centralized exchanges/wallets because using non-custodial wallet the one point one can access your bitcoin is through your seed phrase/private key without it nothing can be done since you said multi sig is not a consideration here.
This definitely shows your ideal doesn't preserve maximum security.
No idea why you wrote something completely wrong. People can use Shamir's Secret Sharing to accomplish this and other ways. It is quite easy and preserves security, no CEX is needed.
https://www.ledger.com/academy/topics/security/shamirs-secret-sharingI have heard about the SSS but the scenario you gave something different and it means the wallet have to be aware of these trusted users. Anyway your link was still helpful to get better idea of SSS, the take here is rather than using ledger or unknown third party, one will opt for their trusted friends and family, if I'm correct.
And all these will be done through the wallet like how proton mail/files operate and being signaled with time limit(days) if such access will be granted by the actual owner?